Marine toxicologist Riki Ott, author of Not One Drop: Betrayal and Courage in the Wake of the Exxon Valdez Oil Spill, has spent the past five months traveling along the Gulf Coast working to address the crisis left behind by the BP oil spill.

Riki spoke with Rose Aguilar of KALW 91.7 FM radio in the San Francisco Bay Area last week, on the six-month anniversary of the disaster, and the following videos capture some of her alarming discoveries about just what is happening in this devastated region.

“These people have oil in their bodies,” said Riki. There are numerous cases of people suffering from decreased lung capacity, enlarged hearts, even dissolving esophaguses.

Take a look at the video interview below for more.

Part One:

Part Two:

Part Three:

Riki Ott is the author of Not One Drop: Betrayal and Courage in the Wake of the Exxon Valdez Oil Spill, available now.